/* ============================================================
   RAM INTERIOR — Digital Catalogue
   A page-flip "book" built with CSS 3D transforms, styled as an
   extension of the site's blueprint → built-material language.
   ============================================================ */

.catalogue-section{
  background:var(--forest-deep);
  border-top:1px solid var(--line-on-dark);
  border-bottom:1px solid var(--line-on-dark);
  padding:clamp(3rem,7vw,5.5rem) 0;
  color:var(--paper-on-dark);
  position:relative;
  overflow:hidden;
}
.catalogue-section::before{
  content:"";
  position:absolute; inset:0;
  background-image:
    linear-gradient(var(--line-on-dark) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-on-dark) 1px, transparent 1px);
  background-size:64px 64px;
  opacity:.35;
  pointer-events:none;
}
.catalogue-section .wrap{ position:relative; }
.catalogue-head{ max-width:640px; margin-bottom:clamp(1.8rem,4vw,2.8rem); }
.catalogue-head .tag-mono{ color:var(--blueprint-lt); display:block; margin-bottom:.6rem; }
.catalogue-head h2{ color:var(--paper-on-dark); font-size:var(--step-3); margin:0 0 .6rem; }
.catalogue-head p{ color:var(--blueprint-lt); margin:0; font-size:var(--step-0); }

.catalogue-cta{ margin-top:clamp(1.8rem,4vw,2.6rem); text-align:center; }
.catalogue-cta .btn{ background:var(--oxide); border-color:var(--oxide); color:var(--forest-deep); }
.catalogue-cta .btn:hover{ background:var(--oxide-dark); border-color:var(--oxide-dark); }

/* ---- Book shell ---- */
.rc-book{
  position:relative;
  width:min(360px,84vw);
  margin:0 auto;
}
.rc-book[data-mode="full"]{ width:min(440px,86vw); }

.rc-stack{
  position:absolute;
  right:-7px; top:8px; bottom:8px;
  width:14px;
  background:repeating-linear-gradient(
    to bottom,
    #E9E2C9 0px, #E9E2C9 2px,
    #D8CFAE 2px, #D8CFAE 4px
  );
  border-radius:0 3px 3px 0;
  box-shadow:2px 2px 10px rgba(0,0,0,.35);
  z-index:0;
}

.rc-stage{
  position:relative;
  aspect-ratio:3/4;
  perspective:2200px;
  border-radius:3px;
  box-shadow:0 18px 44px rgba(0,0,0,.4);
  cursor:pointer;
  z-index:1;
}

.rc-static, .rc-leaf{ position:absolute; inset:0; border-radius:3px; overflow:hidden; }
.rc-static{ z-index:1; }
.rc-leaf{
  z-index:2;
  transform-style:preserve-3d;
  transition:transform .8s cubic-bezier(.5,.05,.28,1);
}
.rc-leaf.rc-hinge-left{ transform-origin:left center; }
.rc-leaf.rc-hinge-right{ transform-origin:right center; }

.rc-leaf-face{
  position:absolute; inset:0;
  backface-visibility:hidden;
  border-radius:3px;
  overflow:hidden;
}
.rc-leaf-back{ transform:rotateY(180deg); }

/* ---- Page faces ---- */
.rc-face{ width:100%; height:100%; display:flex; flex-direction:column; }

.rc-face--image{
  background:var(--stone);
  justify-content:center;
  align-items:center;
  position:relative;
  padding:10px;
}
.rc-face--image picture{
  width:100%; height:calc(100% - 30px);
  display:flex; align-items:center; justify-content:center;
}
.rc-face--image img{
  max-width:100%; max-height:100%;
  object-fit:contain;
  display:block;
  border-radius:2px;
}
.rc-image-caption{
  height:30px; width:100%;
  display:flex; align-items:center; justify-content:center;
}
.rc-image-caption .tag-mono{ color:var(--ink-soft); font-size:var(--step--1); }

.rc-face--divider{
  background:var(--forest);
  color:var(--paper-on-dark);
  align-items:center; justify-content:center; text-align:center;
  padding:2rem;
  gap:.6rem;
}
.rc-divider-eyebrow{ color:var(--oxide); }
.rc-face--divider h3{ font-size:var(--step-2); margin:0; color:var(--paper-on-dark); }
.rc-face--divider p{ color:var(--blueprint-lt); font-size:var(--step--1); margin:0; max-width:26ch; }

.rc-face--cover{
  background:var(--forest-deep);
  color:var(--paper-on-dark);
  align-items:center; justify-content:center; text-align:center;
  padding:2rem;
  position:relative;
  border:1px solid var(--line-on-dark);
}
.rc-face--back{ background:var(--forest); }
.rc-cover-mark{
  font-family:var(--font-display);
  font-size:2.6rem;
  color:var(--oxide);
  border:1.5px solid var(--oxide);
  width:74px; height:74px;
  border-radius:50%;
  display:flex; align-items:center; justify-content:center;
  margin-bottom:1.2rem;
}
.rc-cover-title{ font-size:var(--step-3); margin:0 0 .3rem; color:var(--paper-on-dark); }
.rc-cover-sub{ font-family:var(--font-mono); letter-spacing:.02em; color:var(--blueprint-lt); margin:0; font-size:var(--step--1); }
.rc-cover-tag{ color:var(--blueprint-lt); font-size:var(--step--1); max-width:24ch; line-height:1.5; }
.rc-cover-corner{ position:absolute; width:26px; height:26px; border-color:var(--blueprint-lt); opacity:.6; }
.rc-cover-corner--tl{ top:14px; left:14px; border-top:1.5px solid; border-left:1.5px solid; }
.rc-cover-corner--br{ bottom:14px; right:14px; border-bottom:1.5px solid; border-right:1.5px solid; }

/* ---- Nav ---- */

.rc-index{
  position:absolute; left:50%; bottom:-2.4rem; transform:translateX(-50%);
  font-family:var(--font-mono); font-size:var(--step--1); color:var(--blueprint-lt);
  white-space:nowrap;
}

@media (max-width:900px){
  .rc-stack{ display:none; }
}
@media (max-width:560px){
  .rc-book, .rc-book[data-mode="full"]{ width:min(300px,80vw); }
}

/* ---- Dedicated catalogue page ---- */
.catalogue-page-hint{
  text-align:center; margin-top:clamp(2.4rem,5vw,3.4rem);
  color:var(--blueprint-lt); font-size:var(--step--1);
}